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Resonant photonic structures in porous silicon for biosensing 9

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Resonant photonic structures in porous silicon for biosensin...

Frontiers in Biological Detection: From Nanosensors to Systems IX

作者： Zhao, Yiliang Rodriguez, Gilberto A. Graham, Yasmin M. Cao, Tengfei Gaur, Girija Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University NashvilleTN37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering University of Maryland Baltimore County BaltimoreMD21250 United States

ISBN: (数字)9781510606043

ISBN: (纸本)9781510606036

The formation of resonant photonic structures in porous silicon leverages the benefit of high surface area for improved molecular capture that is characteristic of porous materials with the advantage of high detection sensitivity that is a feature of resonant optical devices. This review provides an overview of the biosensing capabilities of a variety of resonant porous silicon photonic structures including microcavities, Bloch surface waves, ring resonators, and annular Bragg resonators. Detection sensitivities > 1000 nm/RIU are achieved for small molecule detection. The challenge of detecting molecules that approach and exceed the pore diameter is also addressed. © 2017 SPIE.

关键词： Porous silicon

Multi-objective Bayesian materials discovery: Application on the discovery of precipitation strengthened NiTi shape memory alloys through micromechanical modeling

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arXiv 2018年

作者： Solomou, Alexandros Zhao, Guang Boluki, Shahin Joy, Jobin K. Qian, Xiaoning Karaman, Ibrahim Arróyave, Raymundo Lagoudas, Dimitris C. Department of Aerospace Engineering Texas A&M University College StationTX77843 United States Department of Electrical & Computer Engineering Texas A&M University College StationTX77843 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States

In this study, a framework for the multi-objective materials discovery based on Bayesian approaches is developed. The capabilities of the framework are demonstrated on an example case related to the discovery of precipitation strengthened NiTi shape memory alloys with up to three desired properties. In the presented case the framework is used to carry out an efficient search of the shape memory alloys with desired properties while minimizing the required number of computational experiments. The developed scheme features a Bayesian optimal experimental design process that operates in a closed loop. A Gaussian process regression model is utilized in the framework to emulate the response and uncertainty of the physical/computational data while the sequential exploration of the materials design space is carried out by using an optimal policy based on the expected hyper-volume improvement acquisition function. This scalar metric provides a measure of the utility of querying the materials design space at different locations, irrespective of the number of objectives in the performed task. The framework is deployed for the determination of the composition and microstructure of precipitation-strengthened NiTi shape memory alloys with desired properties, while the materials response as a function of microstructure is determined through a thermodynamically-consistent micromechanical model. Copyright © 2018, The Authors. All rights reserved.

关键词： Precipitation (chemical)

Accelerating vapor condensation with daytime radiative cooling

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arXiv 2018年

作者： Zhou, Ming Song, Haomin Xu, Xingyu Shahsafi, Alireza Xia, Zhenyang Ma, Zhenqiang Kats, Mikhail A. Zhu, Jia Ooi, Boon S. Gan, Qiaoqiang Yu, Zongfu Department of Electrical and Computer Engineering University of Wisconsin - Madison MadisonWI53705 United States Department of Electrical Engineering State University of New York at Buffalo BuffaloNY14260 United States School of Materials Science and Engineering Tsinghua University Beijing100084 China College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Thuwal23955-6900 Saudi Arabia

Vapor condensation plays a crucial role in solar water-purification technologies. Conventional condensers in solar water-purification systems do not provide sufficient cooling power for vapor condensation, limiting the water production rate to 0.4 L m-2 hour-1On the other hand, radiative dew condensation, a technique used by existing radiative dew condensers, only works at nighttime and is incompatible with solar water-purification technologies. Here, we develop daytime radiative condensers that reflect almost all solar radiation, and can thus create dew water even in direct sunlight. Compared to state-of-art condensers, our daytime radiative condenser doubles the production of purified water over a 24-hour period. The integration of our daytime radiative condenser with solar water-purification systems can increase the water production rate in sunlight from 0.4 L m-2 hour-1 to more than 1 L m-2 hour-1. Copyright © 2018, The Authors. All rights reserved.

关键词： Condensation

Dressed excitons in carbon nanotubes

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Dressed excitons in carbon nanotubes

CLEO: QELS_Fundamental science, CLEO_QELS 2018

作者： Cong, Kankan Timothy Noe, G. Liu, Huaping Kataura, Hiromichi Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki305-8565 Japan Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

Ultrafast spectroscopy of semiconducting carbon nanotubes reveals transient modifications in the lowest exciton absorption peak. Below-gap excitation induces a blue-shift due to the optical Stark effect, while a Rabi ... 详细信息

ISBN: (纸本)9781943580422

关键词： Carbon nanotubes

Dressed Excitons in Carbon Nanotubes

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Dressed Excitons in Carbon Nanotubes

2018 Conference on Lasers and Electro-Optics, CLEO 2018

作者： Cong, Kankan Noe, G. Timothy Liu, Huaping Kataura, Hiromichi Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki305-8565 Japan Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

ISBN: (纸本)9781943580422

关键词：

electrical homogeneity of large-area chemical vapor deposited multilayer hexagonal boron nitride sheets

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arXiv 2018年

作者： Hui, Fei Fang, Wenjing Leong, Wei Sun Kpulun, Tewa Wang, Haozhe Yang, Hui Ying Villena, Marco A. Harris, Gary Kong, Jing Lanza, Mario Institute of Functional Nano & Soft Materials Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215123 China Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Pillar of Engineering Product Development Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore Department of Electrical and Computer Engineering Howard University WashingtonDC20059 United States

Hexagonal boron nitride (h-BN) is a two dimensional (2D) layered insulator with superior dielectric performance that offers excellent interaction with other 2D materials (e.g. graphene, MoS2). Large-area h-BN can be readily grown on metallic substrates via chemical vapor deposition (CVD), but the impact of local inhomogeneities on the electrical properties of the h-BN and their effect in electronic devices is unknown. Here it is shown that the electrical properties of h-BN stacks grown on polycrystalline Pt vary a lot depending on the crystalline orientation of the Pt grain, but within the same grain the electrical properties of the h-BN are very homogeneous. The reason is that the thickness of the CVD-grown h-BN stack is different on each Pt grain. Conductive atomic force microscopy (CAFM) maps show that the tunneling current across the h-BN stack fluctuates up to 3 orders of magnitude from one Pt grain to another. However, probe station experiments reveal that the variability of electronic devices fabricated within the same Pt grain is surprisingly small. As cutting-edge electronic devices are ultra-scaled, and as the size of the metallic substrate grains can easily exceed 100 μm (in diameter), CVD-grown h-BN stacks may be useful to fabricate electronic devices with low variability. Copyright © 2018, The Authors. All rights reserved.

关键词： III-V semiconductors

Wearable Electronics: Self‐Bondable and Stretchable Conductive Composite Fibers with Spatially Controlled Percolated Ag Nanoparticle Networks: Novel Integration Strategy for Wearable Electronics (Adv. Funct. Mater. 49/2020)

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Advanced Functional materials 2020年第49期30卷 2070321-2070321页

作者： Chaebeen Kwon Duhwan Seong Jeongdae Ha Dongwon Chun Jee‐Hwan Bae Kukro Yoon Minkyu Lee Janghoon Woo Chihyeong Won Seungmin Lee Yongfeng Mei Kyung‐In Jang Donghee Son Taeyoon Lee Nanobio Device Laboratory School of Electrical and Electronic Engineering Yonsei University 50 Yonsei‐ro Seodaemun‐gu Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering Sungkyunkwan University 2066 Seobu‐ro Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Republic of Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) 333 Techno Jungang‐daero Hyeonpung‐eup Dalseong‐gun Daegu 42988 Republic of Korea Advanced Analysis Center Korea Institute of Science and Technology (KIST) 5 Hwarang‐ro 14‐gil Seongbuk‐gu Seoul 02792 Republic of Korea Department of Materials Science Fudan University Shanghai 200438 P. R. China

In article number 2005447, Donghee Son, Taeyoon Lee, and co‐workers develop self‐bondable and self‐weavable fibers as novel components for fiber‐based electronic devices. The fibers are both conductive and stretchable, which eliminates the trade‐off associated with the percolation theory. The integration with self‐bondable and self‐weavable interconnects represents a new integration strategy for fiber‐based devices.

关键词： fiber component integration self‐bondable conductive fibers stretchable and flexible interconnects wearable electronics

Diffuson-driven ultralow thermal conductivity in amorphous Nb2O5 thin films

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arXiv 2018年

作者： Cheng, Zhe Weidenbach, Alex Feng, Tianli Tellekamp, M. Brooks Howard, Sebastian Wahila, Matthew J. Zivasatienraj, Bill Foley, Brian Pantelides, Sokrates T. Piper, Louis F.J. Doolittle, William Graham, Samuel George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Physics and Astronomy Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Physics Applied Physics and Astronomy Binghamton University BinghamtonNY13902 United States Materials Science & Engineering Binghamton University BinghamtonNY13902 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States

Niobium pentoxide (Nb2O5) has been extensively reported for applications of electrochemical energy storage, memristors, solar cells, light emitting diodes (LEDs), and electrochromic devices. The thermal properties of Nb2O5 play a critical role in device performance of these applications. However, very few studies on the thermal properties of Nb2O5 have been reported and a fundamental understanding of heat transport in Nb2O5 is still lacking. The present work closes this gap and provides the first study of thermal conductivity of amorphous Nb2O5 thin films. Ultralow thermal conductivity is observed without any size effect in films as thin as 48 nm, which indicates that propagons contribute negligibly to the thermal conductivity and that the thermal transport is dominated by diffusons. Density-function-theory (DFT) simulations combined with a diffuson-mediated minimum-thermal-conductivity model confirms this finding. Additionally, the measured thermal conductivity is lower than the amorphous limit (Cahill model), which proves that the diffuson model works better than the Cahill model to describe the thermal conduction mechanism in the amorphous Nb2O5 thin films. Additionally, the thermal conductivity does not change significantly with oxygen vacancy concentrationThis stable and low thermal conductivity facilitates excellent performance for applications such as memristors. Copyright © 2018, The Authors. All rights reserved.

关键词： Memristors

CBED Investigations of Boron Monoarsenide Crystals

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Microscopy and Microanalysis 2018年第S1期24卷 30-31页

作者： Yucheng Lan Bing Lv Sz-Chian Liou Jia-An Yan Jiming Bao Jesse Dampare Mobolaji Zon-dode Rola M. Derbeshi Abdellah Lisfi Manfred R. Wuttig Department of Physics and Engineering Physics Morgan State University Baltimore MD USA Department of Physics and TcSUH University of Houston Houston TX USA Department of Physics The University of Texas at Dallas Richardson TX USA Department of Materials Science and Engineering University of Maryland College Park MD USA Department of Physics Towson University Baltimore MD USA Department of Electrical and Computer Engineering University of Houston Houston TX USA